SA828 is an all-in-one professional walkie-talkie module in small size. It is very easy to use with powerful function. This module has full function of a professional walkie-talkie and can talk with any analog walkie-talkie in the market. with the small size, it can be easily embedded into instrument, portable and handheld device. SA828 works well in the hot/cold environment with the KDS 1PPM TCXO. the features of excellent antenna match network, good RF amplifier, high RF sensitivity allow its communication easily to achieve over 3Km in open area. Rotary switch for channel selection, EEPROM, Audio Amplifier, RF Amplifier, PTT key, Antenna socket are all included in such a small size module. Besides, all parameters (CTCSS, CDCSS, SQ, Predefined channels etc) can be easily modified either by PC software or using UART interface. with the embedded audio volume turning circuit, user can only solder a variable resistor on Pin16, Pin17 to adjust the volume steplessly. There are two frequency bands of SA828: SA828-U and SA828-V. the only difference is the frequency range. the others are same, including module size, interface, software protocol, etc. the two modules' frequency ranges are: SA828-U: U band, 400 -- 480MHz SA828-V: V band, 134 -- 174MHz Features: Frequency range: SA828-U: U band, 400 -- 480MHz SA828-V: V band, 134 -- 174MHz Solely TX and RX frequency 12.5/25KHz bandwidth selection 1W Output Power 3~5Km distance in open aera High Sensitivity: -124dBm High Integrated with ultra small size 166 CDCSS, 38 CTCSS 8 SQ High / low output power selection (500mW-1W) Embedded EEPROM, data saved even power off 1ppm TCXO Application: Small size walkie-talkie Pocket / handheld device Security system Instrument Outdoor sport product Audio tracking and control system Material: PC+Metal colour: blue Package Contents: 1 x G-NiceRF Radios Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.